USB CDC ACM

[Lior Smila]

Hi all,

I'm using SDK 15, nrf 52840, win 7,

The USB cdc example works fine for me.

Yet, when I moved the code to my project the driver is not set by win 7.

On device manager I see the device as a "USB composite device".

I used a USB analyzer and found that after few calls the code reaches the function nrf_drv_usbd_setup_stall(); - and I have no idea why.

On the sniffer I see that my code fails when reaching record "Set Configuration (configuration=1) - at this point for some reason the setup in my code reach the stall function.

As I'm not familiar with USB protocol - any help or idea regarding this is most welcome!!!

Regards,

Lior.

[Kenneth]

Hi,

In general stalling an endpoint is fine in USB protocol - it just informs host that something is not supported. But the it should not stall the SET_CONFIGURATION 1 request, so I assume something has failed when you moved the code to your project.

Hard to say now why it happens - I would suggest to turn on logger on DEBUG level and post logs from APP_USBD and APP_USBD_CDC.

Best regards,
Kenneth

 

 

 

[Lior Smila]

USB_CON_FAIL.csv

Thank you for your quick response,

I'm using "Beagle" usb recorder - "data center",

I am attaching a usb data records in a .csv format. Can that help you point out the issue? 

I'm able to receive the power events (DETECT/UNDETECT) on my application.

It looks like for some reason the com port is not opening on the PC

Another input, the example does not use the "soft device" on it - my application does.

Please your help,

Regards,

Lior.

[Lior Smila]

Hi,

So I'm now able to use USB CDC using the EV board with my application.

Yet, when I move to my board, USB does not seem to activate (nothing but USB power events).

My board has an Engineering Ctype   - I saw some erratas dealing with USBD.

I looked on the nRF52840 Engineering C and worked according to it.

In a strange way, nrf_drv_usbd_errata_187 which is relevant for type c , is not recognized by the SW, only when I force to execute the errata code the USB enable started to work - yet only power events active.

Any help is most welcome,

Regards - Lior.

[Kenneth]

You are right there is an error in nrf_drv_usbd_errata.h, the correct implementation of nrf_drv_usbd_errata_type_52840_fp1() should be:

static inline bool nrf_drv_usbd_errata_type_52840_fp1(void)
{
return ( nrf_drv_usbd_errata_type_52840() &&
( ((*(uint32_t *)0xF0000FE8) & 0xF0) == 0x20 ) &&
( ((*(uint32_t *)0xF0000FEC) & 0xF0) == 0x00 ) );
}

This will be fixed in SDKv15.1.

With this change in place, is it your custom board that is now failing, while the EV board works?

[Nandi]

hi,

I have made a HID+MSC composite device. Does this change affect all USB devices?

[Kenneth]

Yes.